Amino Acid Racemization (AAR) Data

Most amino acids can have two different configurations, "D" or "L". Living organisms generally have amino acids
in the "L" configuration, but when the organism dies, the ratio of D/L moves slowly toward equilibrium,
a process called racemization. Measuring the ratio of D/L in a geologic sample containing preserved amino acids
can therefore allow calculations of the age of the sample.